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B4. Wastewater
<br />Emissions of methane from waste water treatment are calculated using the following equation:
<br />Y = (Y)*(R)
<br />A2A1W
<br />Y = annual emissions of methane from waste water treatment, tons/yr.
<br />A2
<br />Y = annual emissions of methane from electricity used for potable water treatment and transportation, tons/yr.
<br />A1
<br />R = ratio between potable water usage and waste water production, 0.56 (USEPA, 1992).
<br />W
<br />Y, tons/yrR *Y, tons/yr
<br />A1WA2
<br />1.395090.560000.78125
<br />* R = ratio between water usage and waste water production based on the ratio between indoor water usage and total water usage per
<br />W
<br />household under the assumption that emissions from potable water treatment and transportation for domestic use are equal to emissions from
<br />waste water transportation and treatment.
<br />C. Summary Table
<br />Emissions,Emissions
<br />Source Typetons/yrtons/yr (GWP)
<br />Construction equipment0.091.89
<br />Motor vehicles22.67476.07
<br />Direct
<br />Landscape equipment1.59E-030.03
<br />Cooling and heating1.5031.59
<br />Total direct, tons/yr24.27509.59
<br />Electricity0.102.00
<br />Potable water1.4029.30
<br />Indirect
<br />Solid waste16.97356.42
<br />Wastewater0.7816.41
<br />Total indirect, tons/yr19.24404.12
<br />Total, tons/yr43.51913.71
<br />Global warming potential index2121
<br />Global warming potential, tons/yr913.7119,187.90
<br />Page 9 of 13
<br />Nitrous Oxide
<br />A. Direct Sources
<br />A1. Mobile Source (Construction Equipment)
<br />Emissions of nitrous oxide from construction equipment are calculated using the following equation:
<br />-1-1
<br />Y = (M)*(E)*(C)*(C)
<br />A12
<br />Y = annual emissions of nitrous oxide from construction equipment, tons/yr.
<br />A
<br />M = annual mileage for construction equipment, miles/yr.
<br />E = emission factor for construction equipment, 0.0048 gr/mile (USEPA Direct Emissions from Mobile Combustion Sources, Climate Leaders,
<br />2004).
<br />C = conversion factor from gr to lbs, 453.59 gr/lbs.
<br />1
<br />C = conversion factor from lbs to tons, 2,000 lbs/ton.
<br />2
<br />M*, miles/yrE, gr/mile
<br />Unit TypeC, gr/lbsC, lbs/tonsY, tons/yr
<br />12A
<br />Non cat heavy-duty truck416625.000.0048453.592,0000.00220
<br />* M = annual mileage for construction equipment based on the ratio between annual emissions of carbon dioxide from construction equipment
<br />(URBEMIS 2007 9.2.2 output file) and the emission factor for carbon monoxide from construction equipment based on the following EMFAC
<br />criteria: 2008 calendar year, all heavy-duty trucks, temperature of 43°F, relative humidity of 74% (average between 63% and 84%, January AM and
<br />PM), and speed of 10 miles/hr.
<br />A2. Mobile Source (Motor Vehicles)
<br />Emissions of nitrous oxide from motor vehicles are calculated using the following equation:
<br />-1-1
<br />Y = (M)*(E)*(C)*(C)
<br />A12
<br />Y = annual emissions of nitrous oxide from motor vehicles, tons/yr.
<br />A
<br />M = annual mileage for motor vehicles, miles/yr (URBEMIS 2007 9.2.2 output file).
<br />E = emission factor for motor vehicles, gr/mile (USEPA Direct Emissions from Mobile Combustion Sources, Climate Leaders, 2004).
<br />C = conversion factor from gr to lbs, 453.59 gr/lbs.
<br />1
<br />C = conversion factor from lbs to tons, 2,000 lbs/ton.
<br />2
<br />M, miles/yrE, gr/mile
<br />Unit TypeC, gr/lbsC, lbs/tonsY, tons/yr
<br />12A
<br />Non cat passenger car0.000.0166453.592,0000.00000
<br />Cat passenger car77275057.440.0518453.592,0004.41241
<br />Diesel passenger car0.000.0161453.592,0000.00000
<br />Non cat light-duty truck0.000.0208453.592,0000.00000
<br />Cat light-duty truck70191510.510.0649453.592,0005.02153
<br />Diesel light-duty truck0.000.0483453.592,0000.00000
<br />Non cat heavy-duty truck0.000.0480453.592,0000.00000
<br />Cat heavy-duty truck5473488.910.1499453.592,0000.90442
<br />Diesel heavy-duty truck4024903.560.0322453.592,0000.14286
<br />Non cat motorcycles1287917.620.0073453.592,0000.01036
<br />Cat motorcycles2736824.950.0073453.592,0000.02202
<br />Total, tons/yr10.51360
<br />A3. Mobile Source (Landscape Equipment)
<br />Emissions of nitrous oxide from landscape equipment are calculated using the following equation:
<br />Y = (YA)*(R)
<br />A21T
<br />Y = annual emissions of nitrous oxide from landscape equipment, tons/yr.
<br />A2
<br />Y = annual emissions of nitrous oxide from motor vehicles, tons/yr.
<br />A1
<br />R = ratio between carbon monoxide unmitigated emissions from motor vehicles and carbon monoxide unmitigated emissions from landscape equipment, (URBEMIS 2007 9.2.2 output file
<br />T
<br />Y, tons/yrR *Y, tons/yr
<br />A1TA2
<br />10.510.000077.40E-04
<br />Page 10 of 13
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